Can pass models to Spring, but Thymeleaf still indicates an error - spring

Question

My problem is that I can pass models between Thymeleaf and Spring, but Thymeleaf still indicates an error.
Spring code:
#GetMapping("{id}/edit")
String getEdit(#PathVariable Long id, Model model) {
postRepository.findById(id).ifPresent(o -> model.addAttribute("post", o));
return "edit";
}
#PostMapping("{id}/edit")
String postEdit(#ModelAttribute Post post) {
postRepository.save(post);
return "redirect:/";
}
Thymeleaf code:
<form th:action="|/${post.id}/edit|" th:method="POST" th:object="${post}">
<input type="text" th:value="*{title}" name="title">
<input type="text" th:value="*{content}" name="content">
<input type="submit" value="Edit">
</form>
Thymeleaf indicates that it can't resolve ${post.id}, *{title} and *{content}. I have stopped and rerun the application more times so I suppose something is amiss in my code, even if it works.
What should I do to solve this issue?

Answer 1

First of all I think you don't need path variable in post mapping. You can use post mapping without path variable. So try modifying you controller like
#PostMapping("/edit")
String postEdit(#ModelAttribute Post post) {
postRepository.save(post);
return "redirect:/";
}
If you write controller like this it will be easy defining path in thymeleaf.
And second error can't resolve *{title} and *{content} is because of invalid keyword. Please try modifying your thymeleaf like
<form th:action="#{/edit}" th:method="POST" th:object="${post}">
<input type="text" th:field="*{title}" name="title">
<input type="text" th:field="*{content}" name="content">
<input type="submit" value="Edit">
</form>
I think this will work as you are expecting.